Cave of crystals

Naica Mines, Chihuahua, Mexico

Editor: This is a coincidental Phoon. My boss had forwarded a link to a BBC show about
caves. I passed that on to friends. Mom replied she saw an almost-Phoon, so I rewatched
the clip. Sure enough! Impressive video worth watching: BBC video (Phoon is at 1:38
mark). The temperature in there is 50C (122F). Everyone had to wear special ice cube suits
and breathing apparatus to survive, exiting the cave with heartrates above 180.